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National Academy of Science of Ukraine Frantsevich Institute for Problems of Materials Science SYNTHETIC CORDIERITE AND PRODUCTS BASED ON IT Manufacturing.

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Presentation on theme: "National Academy of Science of Ukraine Frantsevich Institute for Problems of Materials Science SYNTHETIC CORDIERITE AND PRODUCTS BASED ON IT Manufacturing."— Presentation transcript:

1 National Academy of Science of Ukraine Frantsevich Institute for Problems of Materials Science SYNTHETIC CORDIERITE AND PRODUCTS BASED ON IT Manufacturing of the cordierite ceramics as a single-phase product is among enough difficult physicochemical and technological processes. Complexity of a cordierite (2MgO  2Al 2 O 3  5SiO 2 ) synthesis with the high (95-98 vol. %) contents of a main phase determines by that cordierite forming oxides like magnesia, alumina, silicon oxide have high melting points , 2030 and 1700 о С accordingly, and sintering at 1600 оС. In the same a time the low temperature of incongruous melting cordierite оС does not allow to elevate the temperature of its synthesis above 1400 о С. Thermal resistant ceramic material (synthetic cordierite) Fundamental bases of the directed synthesis of cordierite with the low (2-3 vol. %) contents of extrinsic phases by solid-phase sintering in an interval of temperatures о С and crystallization of quenched glasses are developed in IPMS NASU. The area of the compositions close to stochiometric cordierite, with min. low thermal expansion is determined. Area of compositions of threefold system 2MgO  2Al 2 O 3  5SiO 2, close to stochiometric cordierite, with min. low thermal expansion, made by: а) crystallization of quenched glasses; б) solid-phase synthesis. аб The manufacturing methods for new high spalling-resistant dense and porous (22-24, %) ceramic materials with reduced TKLE ( 0,8-1,2 о С -1  in limits о С, fig. 2) and increased mechanical strength for carrying agents of catalysts and sooty filters are developed on the basis of synthetic cordierite. Dilatometric curves of the cordierite exploratory samples, obtained by a solid-phase synthesis (1), crystallization of quenched glasses (2), quartz glass (3), and a sample cut from the catalytic block of Сornіng Corporatіon production. Open porosity,% Density, g/cm 3 Temperature coefficient of expansion о С, о С  Maximum operating temperature, °C ,90 1,0-1, Properties of porous ceramics based on synthetic cordierite Аuthors: Frantsevich Institute for Problems of Materials Science, NAS of Ukraine, Department 4, Doctor V. Pavlikov, Doctor V. Garmash, Phone. +380(44) ,

2 National Academy of Science of Ukraine Frantsevich Institute for Problems of Materials Science CATALYTIC NEUTRALIZERS FOR AUTOMOBILES WITH GASOLINE ENGINE The catalytic converter intended for complex сleaning from CO, NOx, CxHy of exhaust gases of the automobiles using not ethylated variety of benzine. The converter represents the synthetic cordierite ceramic block with cellular structure of the cylindrical form with volume from 1 litre. On a surface of internal channels the shallow layer of the secondary carrying agent from adamant is put, which improves in dozens of times (up to m 2 /g) specific surface and ternary platinum-paladium-ruthenic catalyst. The contents of active components - platinum metals is 3,5 g on kg of the ceramic carrying agent. Complex catalyst with replacement of a part of platinum with oxide of rare-earth metal is developed and passes test. Ceramic blockCatalytic afterburner Advantages MaterialDimen- sions of the block, mm Number of chan- nels in a cross- section on1sm 2 Dimen- sions of the chan- nel,mm Thick- ness of a wall, mm Starting СО, NOx, CxHy oxidizing reaction temperature, o C Temperature of 100 % СО,NOx, CxHy, conversion, о С 1. Reduced starting oxidizing reaction temperature 2. Reduced temperature of 100 %transformation 3. Economy of platinum metals - up to 30 % Synthetic cordierite d= h= х10,2230, 50 % conversion 400 Walker Linda Gobex IPMS СО removal IPMS Walker Linda Gobex С х Н у removal Results of the test performance catalytic converter at different temperatures Аuthors: Frantsevich Institute for Problems of Materials Science, NAS of Ukraine, Department 4, Doctor V. Pavlikov, Doctor V. Garmash, Phone. +380(44) ,

3 National Academy of Science of Ukraine Frantsevich Institute for Problems of Materials Science CERAMIC PARTICULATE FILTER WITH CATALYTIC COATING The filter represents the ceramic cylindrical monolyte with cellular structure and volume up to 3 litres. Material of the block is synthetic cordierite. On a surface of internal channels and pores the shallow layer of the secondary carrying agent and the catalyst on the basis of oxides of transition metals is put. Ceramic material - synthetic cordierite Open porosity, %55-60 Average pore size, micron10-15 Density, g / sm 3 1,5 Coefficient of thermal expansion in the temperature range о С, о С -1  ,6-0,9 Limiting operating temperature, о С1200 Specific surface, m 2 / m General surface, m 2 55 Ceramic sooty filter with a catalytic coatCommercial advantages 1. Cylindrical monolite dimensions, mmd=120 mm; h=150 mm Temperature of soot oxidizing is comparable to temperature of EIC’s exhausts – automatic filter regeneration 2. Dimensions of the channel, mm 4444 3. Wall thickness of the channel, mm1 4. Catalytic coat on the basis of oxides of the transition metals Oxidizing of soot at о С 5. Trapping of particles depending on their size, %95, starting with 10 nm Trapping of soot nano particles 6. Hydraulic resistance at air consumption 300 kg/h, sm of water column Temperature of 100 % СО,NOx, CxHy, conversion, о С 420 Developed sooty filters can be used for making two-stage system of catalytic neutralization of exhaust gases, starting from low temperatures (start and warming-up of the drive) when traditional catalytic neutralizers are insufficiently effective (so-called problem of "cool start”) % t=250 o  CO t=300 o C t=385 o C t=250 o C t=300 o C t=38 5 o C DD  NOx Аuthors: Frantsevich Institute for Problems of Materials Science, NAS of Ukraine, Department 4, Doctor V. Pavlikov, Doctor V. Garmash, Phone. +380(44) , Test results efficiency particulate filter with catalytic coating at different temperatures

4 National Academy of Science of Ukraine Frantsevich Institute for Problems of Materials Science CERAMIC FILTERS FOR MELTS OF METALS Filters with honeycomb and cellular structure for refining (filtration) metal melts at a temperature operation up to 1650 ° C are based on synthetic mullite and mulite-zircon using domestic raw materials (kaolin, zircon, alumina). In combination with low temperature synthesis of mullite ( ° C) ceramic filters based on mullite and mulite-zircon can be competitive in the CIS markets. Аuthors: Frantsevich Institute for Problems of Materials Science, NAS of Ukraine, Department 4, Doctor V. Pavlikov, Doctor V. Garmash, Phone. +380(44) , Materialmullite, mulite-zircon Channel sizes, mm0,5-4 Channels of 1 cm Thickness of the channel wall, mm1 Maximum operating temperature, ° C1650 Porosity,%50-70 Specific surface, cm 2 / g>4х10 4 Compressive strength, MPa>10 Coefficient of thermal expansion in the temperature range о С, о С -1  ,8 Number of cycles (initial-maximum operating temperature) 5 Key performance of ceramic filters


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